Implicit conversions of head-const to tail-const ranges

[Per Nordlöw]

On Tuesday, 23 March 2021 at 16:50:24 UTC, Per Nordlöw wrote:
> Has there been any attempts in dmd to generalize implicit 
> conversions to allow implicit conversion of a head-const to 
> tail-const range? Similar to what already happens for dynamic 
> arrays (slices).
>
> Are there any apparent show-stoppers?

Do we want such a change to affect

@safe unittest
{
     import std.algorithm.iteration : map;
     import std.stdio;
     auto x = [1, 2];
     const y = x.map!(_ => _*_);
     writeln(y);
}

currently printing

     const(MapResult!(__lambda2, int[]))([1, 2])

to instead print

     [1, 4]

?

I guess not.